How to open a pre-populated form to create a record in Crm 2011 using Javascript

Hi,

I have a requirement where on save of an Account record, a new  Account form should open in a new window to create a new Account record and when the form opens its fields should be pre populated with values on the previous form(i.e the record we created before this form opened) using Javascript. How can I do that ? 

Can someone help me with a piece of code?

Thanks